The most harmful organic substance to nature is botulinum toxin which is also called the miracle poison.
Botulinum toxin or miracle poison is a toxic and harmful substance that is produced by the bacterium called Clostridium botulinum.
The neurotoxin is extremely and highly lethal and can cause paralysis by blocking the nerve cells to the muscles.
Botulinum toxin is one of the most poisonous biological substances known and can even cause death.
And while botulinum toxin is a naturally occurring substance, it's effects can also be long lasting and devastating.
Even a very small amount and as little as 1 nanogram per kilogram of botulinum toxin can be lethal or fatal to humans.
While botulinum toxin is incredibly toxic, it's also important to note that the toxicity of substances can be measured in different ways, and there may be other factors to consider when comparing them.
For example, polonium, a radioactive metal, is also highly toxic due to its radioactivity.
However, botulinum toxin's potency in terms of its lethal dose (LD50) places it at the top of the list for most toxic substances.